Cross‐Linked Multifunctional Conjugated Polymers Prepared by In Situ Electrochemical Deposition for a Highly‐Efficient Blue‐Emitting and Electron‐Transport Layer

Abstract

An efficient and controllable approach to prepare cross-linked films from a conjugated polymer precursor by electrochemical deposition (ED) is reported for the first time. A novel polymer precursor with high solubility, high electroactivity, and electron-transport ability has been designed. The electrochemically deposited polymer film shows high thickness, smooth morphology, and high fluorescence. The single-layer pure-blue-emitting ED PLED exhibits a luminous efficiency of 3.8 cd A(-1) .

Cascade exciton-pumping engines with manipulated speed and efficiency in light-harvesting porous π-network films

“…N -Substituted carbazole units, upon electro-oxidative reaction, form radical cation species that are highly active toward coupling with each other and yield dimers in near-unity efficiency without the generation of other oligomers43444546. The POP thin films were formed on an ITO electrode via multicycled cyclic voltammetry (CV) of TPSC.…”

“…Consequently, we employed a potential range between −0.8 and 1.0 V for the film deposition; this positive potential can only oxidise the carbazole units, whereas the sufficiently low negative potential ensures the complete reduction of the dimeric carbazyl cations and removal of their counterions (PF 6 − ) from the films474849. From the second cycle in the continuous CV scan (Figure S1b), the current attributed to the oxidation of dimeric carbazoles at 0.83 V increased with increasing cycle number; thus, more dimeric carbazole formed and the POP films progressively grew on the electrode43444546.…”

A novel electropolymerized fluorescent film probe for TNT based on electro-active conjugated copolymer

“…[10] Second, it could have the amplification properties (molecular wire effect) as conjugated polymers. [11] Though, some small molecules precursor could also form the cross-linking network with good fluorescent efficiency, the effective length of the conjugated system is limited by the small molecules themselves. Using conjugated polymers as the precursor could enhance the effective length of the conjugated system.…”

Electrochemical nanoarchitectonics and layer-by-layer assembly: From basics to future

“…Elaboration of highly luminescent films by electrochemical synthesis using rational molecular design and controlled electrochemical deposition was thus demonstrated [295][296][297]. Ma and coworkers reported highly efficient blue LEDs based on polymer [298] and white LEDs based on small molecules [299,300]. The latter typically exhibited the best performances with a luminance efficiency of 6.7 cd/A and brightness of ∼10 5 cd/m 2 .…”